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                                <h1 id="map&#x548C;weakmap">Map&#x548C;WeakMap</h1>
<p>json&#x7684;key&#x53EA;&#x80FD;&#x662F;&#x5B57;&#x7B26;&#x4E32;,&#x4F46;&#x662F;map&#x7684;key&#x53EF;&#x4EE5;&#x662F;&#x4EFB;&#x610F;&#x7C7B;&#x578B;&#x5BF9;&#x8C61;</p>
<p>&#x793A;&#x4F8B;:  </p>
<pre><code class="lang-html"><span class="hljs-meta">&lt;!DOCTYPE html&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">html</span> <span class="hljs-attr">lang</span>=<span class="hljs-string">&quot;en&quot;</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">head</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">&quot;UTF-8&quot;</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">title</span>&gt;</span>Title<span class="hljs-tag">&lt;/<span class="hljs-name">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">script</span>&gt;</span><span class="javascript">
    <span class="hljs-keyword">let</span> map = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Map</span>();
    <span class="hljs-keyword">let</span> json = {
      a:<span class="hljs-number">1</span>,
      b:<span class="hljs-number">2</span>
    };
    map.set(<span class="hljs-string">&apos;aaa&apos;</span>, json);
    <span class="hljs-comment">//map.set(json, &apos;aaa&apos;); //ok</span>
    <span class="hljs-comment">//console.log(map);</span>
    <span class="hljs-comment">//console.log(map.get(json)); //&#x83B7;&#x53D6;&#x503C;</span>
    <span class="hljs-comment">//map.delete(key) //&#x5220;&#x9664;</span>
    <span class="hljs-comment">//map.has(key) &#x5224;&#x65AD;&#x6709;&#x6CA1;&#x6709;</span>
    <span class="hljs-comment">//map.clear(); //&#x6E05;&#x7A7A;</span>

    <span class="hljs-comment">/**&#x5FAA;&#x73AF;
    for (let [key, value] of map) {
      console.log(key, value);
    }
    for (let value of map.values()) {

    }
    for (let [key, value] of map.entries()) {

    }
    map.forEach((value, key) =&gt; {

    })*/</span>
  </span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span>
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